Title: Varistor and manufacturing method therefor
Application Number: 03801124 Application Date: 2003.07.04
Publication Number: 1557003 Publication Date: 2004.12.22
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C04B35/453,H01C7/10
Applicant(s) Name: Murata Manufacturing Co. Address:
Inventor(s) Name:
Attorney & Agent: chen ruifeng
Abstract:
     The raw material for a ZnO-Pr-based varistor is mixed with cobalt and potassium to prepare a ceramic raw material powder. Potassium, which is an alkali metal, is added in the form of KClO4, KHC4H4O6, PtCl6, or K2[Co(NO2)4]. The ceramic raw material powder is pulverized by a wet process while 0.1 to 5.0 wt % of polycarboxylate dispersant is added to the powder. Such a method can produce a reliable, high-quality varistor having excellent varistor characteristics, such as varistor voltage V1 ma and insulation resistance IR, and less variation in these characteristics.
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